First, DV is supposed to use random selection (lottery) - so the resulting distribution should reflect the statistical makeup of the applicant pool.
Second, one of the DV requirements is a high school diploma - so the pool is biased towards higher education from the start.
Third, the rest of the process (documentation, online application, English/affidavit/liquidity requirements) again favors educated/affluent individuals.
So I posit that the opposite is true: DV is selecting from a highly-skilled applicant pool, and the benefitting immigrants are better educated than the average population.
Anecdotal evidence: all DV immigrants I know (including myself) hold at least a bachelor degree, and work in high-skill professional fields.